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Olson Park, IL Weather Forecast
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Olson Park Weather Forecast
| LATE THIS AFTERNOON | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy |
| Hi: 69°FHi: 21°C | Lo: 61°FLo: 16°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 61°FHi: 16°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C |
| POP: 70% | POP: 100% | POP: 90% | POP: 20% | POP: 40% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 401 PM CDT Sat Sep 19 2026 
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Issued: 716 PM CDT Sat Sep 19 2026
Key Messages
- A Flood Watch for flash flooding has been extended for areas roughly near and north of I-80 through early Sunday morning.
- Heavy rain-producing showers and thunderstorms are expected to redevelop, as early as late this afternoon, but most likely this evening and overnight. Localized flash flooding will be possible where the heaviest rains occur over the same areas.
- Showers/drizzle and perhaps an isolated thunderstorm likely to continue for most of the area through the day on Sunday. P...